So it seems that the issue was related to the email problem. I would still like to know what could have been the reason for only some of the sites of a wordpress multisite were affected and not others. Most of them have their domains registered in godaddy, of those pages only a few of them were affected. Soma had domain .com, .co.uk, .pe - and were affected. Something that they had in common was that the email was not managed by my hosting provider but by outlook. I am intrigued to what could have been the issue.
